Automatic chuck for screw machines



C. F. WHITMAN.

AUTOMATIC CHUCK FOR SCREW MACHINES.

APPL|CAT10N FILED MAY 20, I920.

Patented Aug. 8, 1922.

UNHTED earner orrrcao CHARLES F. WHITBIAN, OF DETROIT, MICHIGAN,ASSIGNOR TO AUTOIEATIC PRODUCTS COMPANY, OF DETROIT, MICHIGAN,CORPORATION OF MICHIGAN.

AUTOMATIC CHUCK FOR SCREW' llU-iCI-IINES.

Application filed May 20,

To all whom it may concern Be it known that I, CHARLES F. WHIT- MAN, acitizen of the United States of America, residing at Detroit, in thecounty of lVayne and State of Michigan, have invented certain new anduseful Improvements in AutomaticChucks for Screw Machines, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

This invention relates to an automatic chuck for screw machines, and hasspecial reference to that class of chucks for holding dies adapted forthreading screws, bolts or the ends of rods or similar members, thethreading operation being automatic so that screws may be expeditiouslyand economically produced by an automatic screw machine.

My invention aims to provide a die holding chuck which will ermit of thedie being driven for a threading operation and after the operation isperformed the die holding portion of the chuck is released so that thescrew or member being threaded may back the die off of the same andpermit of the screw or member being removed from the machine. Toaccomplish this the chuck is made in two parts normally maintainedinterlocked so that the parts of the chuck may be bodily reciprocatedand rotated, particularly during a threading operation. With the partsof the chuck separable it is possible to retract the driven part andallow the remaining die holding part to be actuated or retracted by thescrew or member operated upon.

My invention will be hereinafter considered in detail and then claimed,and reference will now be had to the drawing, wherein- Figure 1 is aside elevation of the chuck as associated with a portion of the screwmachine;

Fig. 2 is a longitudinal sectional view of the chuck showing the partsthereof interlocked;

Fig. 3 is a side elevation of the same showing the parts of the chuckseparated, and

Fig. & is a cross sectional view taken on the line IV-IV of Fig. 3.

In order that my invention may be understood, I show a portion of amachine screw bed 1 having shears or ways 2 for a reciprocable headstock 3 which ma be Specification of Letters I-atent.

Patented Aug. 8, i922.

1920. Serial No. 382,889.

a conventional form of die 10 detachably:

held by set screws 11. The die 10 is adapted to thread the screw 6 andthe tubular stem 8 providesclearance for the screw as the same isthreaded.

On the inner end of the tubular stem 8 are abutments or nuts 12 andinterposed be tween the driven chuck member 7 and said abutments 1s acoiled spring 13 which surrounds the tubular stem 8so that its expansiveforce may hold the die chuck member retracted or in proximity to thedriven chuck member 7.

The confronting faces of the chuck members 7 and 9 are provided with aseries of studs or pins 14 serving functionally as jaws so that thechuck members may interlock for rotation in synchronism, the studs ofthe die chuck member 9 extending into the path of rotation of the studsof the driven chuck member 7 whereby said studs will contact and causethe die chuck member 9 to be driven in unison with the driven chuckmember 7.

Considering the normal condition of the chuck, which is shown in Fig. 1,and assuming that the screw 6 is to be threaded, the head stock is fedtowards the screw until the die 10 engages the same and advances thereonfor threading purposes. During this operation the screw 6 is revolved ata greater speed than the die chuck and as the die takes hold of thescrew it is carried outwardly from the driven chuck member 7 until thestuds 14 are out of engagement and the spring 13 under compression, asshown in Fig. 3. Of course during this threading operation the headstock has been limited in its advance towards the tail stock, but thechuck member 7 is constantly driven; By the time the threading operationis completed the studs 14 are out of engagement and since the screw 6 isrotated at a greater speed than the driven chuck member 7, the die 10will start to back off of the screw. It is at this point in theoperation that the head stock 3 recedes so that the released die chuckmember cannot interlock with the driven chuck, and particularly theautomatic con nection which is established between the chuck parts ormembers at predetermined periods during the operation of the chuck.

One embodiment of my invention has been i'llustrated', but it is to beunderstood thatv the structural elements are susceptible to suchvariations and modifications as fall =within the scope of the appendedclaims.

What I claim is 1. Achuck of the type described, comprising a drivenchuck member, a die chuck member, atubular stem carried by said diechuck member and extending through said driven chuck member, studs onthe confronting faces-of said members adapted to interlock said chuckmembers for a driving relation,

and a spring on said tubular stem against said driven chuck member andholding said die chuck member relative to said driven chuck member sothat during the operation of said die chuckmember it may be releasedfrom said driven chuck member and again interlocked therewith after'eachoperation.

2. In a screw machine wherein" a rotatable cscrew blank is adapted to bethreaded by a die advancing towards the screw blank, means adapted .toadvance the die and revolve it at less speed than the screw blank,

said means comprlsing' a die chuck member supportingthe die, a drivenchuck interlocked with said die chuck for rotating it, .a springinterposed between portions of said chuck members and maintaining w anoperative relatlon between said chuck members, said spring permittingsaid" driven chuck to recede so that the die may be backed oil" thescrew and allow said spring to establish a driving relation betweensaid.v chuck members. i,

In testimony whereof I afiix my slgnature 1n the presence of twowitnesses.

CHARLES 1 WHITMAN.

Witnesses: a

E. J. HOPPA, J. M. JOHNSON.

